Temperature and concentration effects on the viscoelasticity of concentrated aqueous solutions of bile salts in the ultrasonic range

Abstract

Measurements of longitudinal ultrasonic absorption in a concentrated aqueous solution of the bile salt sodium deoxycholate at different temperatures enable a better characterization of the exhibited viscoelasticity. An analysis of the data in the viscoelastic region shows that the dynamic shear viscosity follows a temperature and concentration superposition principle and that the volume viscosity is small. Such conclusions support a previously suggested possibility of polymerization of the small "primary" micelles observed at low concentration.